1.媒体来源:
The New York Times
http://www.nytimes.com/pages/science/index.html
A. Gamma Rays May Be Clue on Dark Matter
珈码射线可能是暗物质存在的线索
内容:
A small, newly discovered galaxy orbiting the Milky Way is emitting a
surprising amount of electromagnetic radiation in the form of gamma rays,
astronomers reported Tuesday. The finding may be the latest in a long string
of cosmic false alarms, they said, or it might be that the mysterious dark
matter that permeates the universe is finally showing a bit of leg.
周二，天文学家指出，他们发现了一个全新的银河，环绕着整个银河系，并且发出很
强的珈码射线。这个新发现也许是错的，但也很可能是长久以来始终神秘的暗物质露
出的第一道曙光。
If confirmed, the results could mean that most of the matter of the universe
is in the form of as-yet-unidentified elementary particles, 20 to 100 times
as heavy as a proton, that have been drifting and clumping like fog in space
ever since the Big Bang.
如果这像新发现能被确认的话，我们就能够说，自宇宙产生以来，所有的物质都是由一
种基本粒子所组成，它的重量大概是质子的的20~100分之一重。
完整新闻连结:
http://ppt.cc/-3R1A
B.Farmers Put Down the Plow for More Productive Soil
想让土壤更多养分?放下犁吧 !
内容：
He is talking about farming, specifically soil-conservation farming, a
movement that promotes leaving fields untilled, “green manures” and other
soil-enhancing methods with an almost evangelistic fervor.
保守型的耕作法，主张让土壤休息。
He no longer needs to use nitrogen fertilizer or fungicide, he said, and he
produces yields that are above the county average with less labor and lower
costs. “Nature can heal if we give her the chance,” Mr. Brown said.
布朗主张：不需要使用氮肥或杀菌剂，大自然会用最自然的方式让土壤复原。
他们在最少的资金和劳力下，有更多的产出。
Continue reading the main story
But repeated plowing exacts a price. It degrades soil, killing off its
biology, including beneficial fungi and earthworms, and leaving it, as Mr.
Archuleta puts it, “naked, thirsty, hungry and running a fever.”
持续的耕种会让土壤变的贫脊，对细菌、蚯蚓等都有很负面的影响；
让土壤休息就是对土壤最好地办法。
Degraded soil requires heavy applications of synthetic fertilizer to produce
high yields. And because its structure has broken down, the soil washes away
easily in heavy rain, taking nitrogen and other pollutants with it into
rivers and streams.
贫脊的土壤需要更多的合成肥料来提高产出，但可能一场大雨，就会把很多氮肥或污
染物冲入河中。
Soil health proponents say that by leaving fields unplowed and using cover
crops, which act as sinks for nitrogen and other nutrients, growers can
increase the amount of organic matter in their soil, making it better able to
absorb and retain water.
土壤健康学的支持者主张，停止耕犁并使用覆蓋作物，土壤的有机物会逐渐增加，
并更能蓄藏水份。
完整新闻连结：
http://ppt.cc/PpaJ